package com.atguigu.netty.webSocket;

import com.atguigu.netty.heartbeat.MyServerHandler;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.netty.handler.timeout.IdleStateHandler;

import java.util.concurrent.TimeUnit;

public class MyServer {
    public static void main(String[] args) throws InterruptedException {
        NioEventLoopGroup bossGroup = new NioEventLoopGroup();
        NioEventLoopGroup workGroup = new NioEventLoopGroup();
        try{
            ServerBootstrap serverBootstrap=new ServerBootstrap();
            serverBootstrap.group(bossGroup,workGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO)) //在bossGroup中增加一个日志处理器
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ChannelPipeline pipeline = socketChannel.pipeline();

                            //因为基于http协议，使用http编码和解码器
                            pipeline.addLast(new HttpServerCodec());
                            //是以块方式写的，添加chunkedWrite处理器
                            pipeline.addLast(new ChunkedWriteHandler());
                            /*
                            1.http数据在传输过程中是分段的，HttpObjectAggregator,就是可以将多个段聚合起来
                            2.这就是为什么，当浏览器发送大量数据时，就会发出多次http请求
                             */
                            pipeline.addLast(new HttpObjectAggregator(8192));
                            /*
                            1.对于websocket,它的数据是以帧（frame）的形式传递
                            2.可以看到webSocketFrame下面有六个子类
                            3.浏览器请求时 ws://localhost:7000/xxx 表示请求的uri
                            4.WebSocketServerProtocolHandler核心功能是将http协议升级为ws协议，保持长连接

                            5.是通过一个状态码 101
                             */
                            pipeline.addLast(new WebSocketServerProtocolHandler("/hello"));

                            //自定义的handler,处理业务逻辑
                            pipeline.addLast(new MyTextWebSocketFrameHandler());
                        }
                    });
            ChannelFuture channelFuture = serverBootstrap.bind(7000);
            channelFuture.channel().closeFuture().sync();
        }finally {
            bossGroup.shutdownGracefully();
            workGroup.shutdownGracefully();
        }
    }
}
